示例#1
0
/**
 * Calculates the trajectory for a curved path.
 * @param accuracy The unit's accuracy.
 * @param doTestTrajectory
 * @return True when a trajectory is possible.
 */
int Projectile::calculateThrow(double accuracy, bool doTestTrajectory)
{
	Tile *targetTile = _save->getTile(_action.target);
		
	Position originVoxel = _save->getTileEngine()->getOriginVoxel(_action, 0);
	Position targetVoxel = _action.target * Position(16,16,24) + Position(8,8, (2 + -targetTile->getTerrainLevel()));

	if (_action.type != BA_THROW)
	{
		BattleUnit *tu = targetTile->getUnit();
		if (!tu && _action.target.z > 0 && targetTile->hasNoFloor(0))
			tu = _save->getTile(_action.target - Position(0, 0, 1))->getUnit();
		if (tu)
		{
			targetVoxel.z += ((tu->getHeight()/2) + tu->getFloatHeight()) - 2;
		}
	}

	double curvature = 0.0;
	int retVal = V_OUTOFBOUNDS;
	if (_save->getTileEngine()->validateThrow(_action, originVoxel, targetVoxel, &curvature, &retVal))
	{
		if (doTestTrajectory)
		{
			return V_FLOOR;	// retVal;
		}

		int test = V_OUTOFBOUNDS;
		// finally do a line calculation and store this trajectory, make sure it's valid.
		while (test == V_OUTOFBOUNDS)
		{
			Position deltas = targetVoxel;
			// apply some accuracy modifiers
			applyAccuracy(originVoxel, &deltas, accuracy, true, _save->getTile(_action.target), false); //calling for best flavor
			deltas -= targetVoxel;
			_trajectory.clear();
			test = _save->getTileEngine()->calculateParabola(originVoxel, targetVoxel, true, &_trajectory, _action.actor, curvature, deltas);

			Position endPoint = _trajectory.back();
			endPoint.x /= 16;
			endPoint.y /= 16;
			endPoint.z /= 24;
			Tile *endTile = _save->getTile(endPoint);
			// check if the item would land on a tile with a blocking object
			if (_action.type == BA_THROW
				&& endTile
				&& endTile->getMapData(MapData::O_OBJECT)
				&& endTile->getMapData(MapData::O_OBJECT)->getTUCost(MT_WALK) == 255)
			{
				test = V_OUTOFBOUNDS;
			}
		}
		return retVal;
	}
	return V_OUTOFBOUNDS;
}
示例#2
0
/**
 * Runs state functionality every cycle.
 */
void UnitWalkBState::think()
{
	bool unitSpotted = false;
	int size = _unit->getArmor()->getSize() - 1;
	bool onScreen = (_unit->getVisible() && _parent->getMap()->getCamera()->isOnScreen(_unit->getPosition(), true, size, false));
	if (_unit->isKneeled())
	{
		if (_parent->kneel(_unit))
		{
			_unit->setCache(0);
			_terrain->calculateFOV(_unit);
			_parent->getMap()->cacheUnit(_unit);
			return;
		}
		else
		{
			_action.result = "STR_NOT_ENOUGH_TIME_UNITS";
			_pf->abortPath();
			_parent->popState();
			return;
		}
	}
	Tile *tileBelow = _parent->getSave()->getTile(_unit->getPosition() + Position(0,0,-1));

	if (_unit->isOut())
	{
		_pf->abortPath();
		_parent->popState();
		return;
	}

	if (_unit->getStatus() == STATUS_WALKING || _unit->getStatus() == STATUS_FLYING)
	{
		if ((_parent->getSave()->getTile(_unit->getDestination())->getUnit() == 0) || // next tile must be not occupied
			(_parent->getSave()->getTile(_unit->getDestination())->getUnit() == _unit))
		{
			bool onScreenBoundary = (_unit->getVisible() && _parent->getMap()->getCamera()->isOnScreen(_unit->getPosition(), true, size, true));
			_unit->keepWalking(tileBelow, onScreenBoundary); // advances the phase
			playMovementSound();
		}
		else if (!_falling)
		{
			_unit->lookAt(_unit->getDestination(), (_unit->getTurretType() != -1));	// turn to undiscovered unit
			_pf->abortPath();
		}

		// unit moved from one tile to the other, update the tiles
		if (_unit->getPosition() != _unit->getLastPosition())
		{
			bool largeCheck = true;
			for (int x = size; x >= 0; x--)
			{
				for (int y = size; y >= 0; y--)
				{
					Tile *otherTileBelow = _parent->getSave()->getTile(_unit->getPosition() + Position(x,y,-1));
					if (!_parent->getSave()->getTile(_unit->getPosition() + Position(x,y,0))->hasNoFloor(otherTileBelow) || _unit->getMovementType() == MT_FLY)
						largeCheck = false;
					_parent->getSave()->getTile(_unit->getLastPosition() + Position(x,y,0))->setUnit(0);
				}
			}
			for (int x = size; x >= 0; x--)
			{
				for (int y = size; y >= 0; y--)
				{
					_parent->getSave()->getTile(_unit->getPosition() + Position(x,y,0))->setUnit(_unit, _parent->getSave()->getTile(_unit->getPosition() + Position(x,y,-1)));
				}
			}
			_falling = largeCheck && _unit->getPosition().z != 0 && _unit->getTile()->hasNoFloor(tileBelow) && _unit->getMovementType() != MT_FLY && _unit->getWalkingPhase() == 0;

			if (_falling)
			{
				for (int x = size; x >= 0; --x)
				{
					for (int y = size; y >= 0; --y)
					{
						Tile *otherTileBelow = _parent->getSave()->getTile(_unit->getPosition() + Position(x,y,-1));
						if (otherTileBelow && otherTileBelow->getUnit())
						{
							_falling = false;
							_pf->dequeuePath();
							_parent->getSave()->addFallingUnit(_unit);
							_parent->statePushFront(new UnitFallBState(_parent));
							return;
						}
					}
				}
			}

			if (!_parent->getMap()->getCamera()->isOnScreen(_unit->getPosition(), true, size, false) && _unit->getFaction() != FACTION_PLAYER && _unit->getVisible())
				_parent->getMap()->getCamera()->centerOnPosition(_unit->getPosition());
			// if the unit changed level, camera changes level with
			_parent->getMap()->getCamera()->setViewLevel(_unit->getPosition().z);
		}

		// is the step finished?
		if (_unit->getStatus() == STATUS_STANDING)
		{
			// update the TU display
			_parent->getSave()->getBattleState()->updateSoldierInfo();
			// if the unit burns floortiles, burn floortiles as long as we're not falling
			if (!_falling && (_unit->getSpecialAbility() == SPECAB_BURNFLOOR || _unit->getSpecialAbility() == SPECAB_BURN_AND_EXPLODE))
			{
				_unit->getTile()->ignite(1);
				Position posHere = _unit->getPosition();
				Position voxelHere = (posHere * Position(16,16,24)) + Position(8,8,-(_unit->getTile()->getTerrainLevel()));
				_parent->getTileEngine()->hit(voxelHere, _unit->getBaseStats()->strength, DT_IN, _unit);
				
				if (_unit->getStatus() != STATUS_STANDING) // ie: we burned a hole in the floor and fell through it
				{
					_pf->abortPath();
					return;
				}
			}

			// move our personal lighting with us
			_terrain->calculateUnitLighting();
			if (_unit->getFaction() != FACTION_PLAYER)
			{
				_unit->setVisible(false);
			}
			_terrain->calculateFOV(_unit->getPosition());
			unitSpotted = (!_falling && !_action.desperate && _parent->getPanicHandled() && _numUnitsSpotted != _unit->getUnitsSpottedThisTurn().size());

			if (_parent->checkForProximityGrenades(_unit))
			{
				_parent->popState();
				return;
			}
			if (unitSpotted)
			{
				_unit->setCache(0);
				_parent->getMap()->cacheUnit(_unit);
				_pf->abortPath();
				_parent->popState();
				return;
			}
			// check for reaction fire
			if (!_falling)
			{
				if (_terrain->checkReactionFire(_unit))
				{
					// unit got fired upon - stop walking
					_unit->setCache(0);
					_parent->getMap()->cacheUnit(_unit);
					_pf->abortPath();
					_parent->popState();
					return;
				}
			}
		}
		else if (onScreen)
		{
			// make sure the unit sprites are up to date
			if (_pf->getStrafeMove())
			{
				// This is where we fake out the strafe movement direction so the unit "moonwalks"
				int dirTemp = _unit->getDirection();
				_unit->setDirection(_unit->getFaceDirection());
				_parent->getMap()->cacheUnit(_unit);
				_unit->setDirection(dirTemp);
			}
			else
			{
				_parent->getMap()->cacheUnit(_unit);
			}
		}
	}

	// we are just standing around, shouldn't we be walking?
	if (_unit->getStatus() == STATUS_STANDING || _unit->getStatus() == STATUS_PANICKING)
	{
		// check if we did spot new units
		if (unitSpotted && !_action.desperate && _unit->getCharging() == 0 && !_falling)
		{
			if (Options::traceAI) { Log(LOG_INFO) << "Uh-oh! Company!"; }
			_unit->setHiding(false); // clearly we're not hidden now
			_parent->getMap()->cacheUnit(_unit);
			postPathProcedures();
			return;
		}

		if (onScreen || _parent->getSave()->getDebugMode())
		{
			setNormalWalkSpeed();
		}
		else
		{
			_parent->setStateInterval(0);
		}
		int dir = _pf->getStartDirection();
		if (_falling)
		{
			dir = Pathfinding::DIR_DOWN;
		}

		if (dir != -1)
		{
			if (_pf->getStrafeMove())
			{
				_unit->setFaceDirection(_unit->getDirection());
			}

			Position destination;
			int tu = _pf->getTUCost(_unit->getPosition(), dir, &destination, _unit, 0, false); // gets tu cost, but also gets the destination position.
			if (_unit->getFaction() != FACTION_PLAYER &&
				_unit->getSpecialAbility() < SPECAB_BURNFLOOR &&
				_parent->getSave()->getTile(destination) &&
				_parent->getSave()->getTile(destination)->getFire() > 0)
			{
				tu -= 32; // we artificially inflate the TU cost by 32 points in getTUCost under these conditions, so we have to deflate it here.
			}
			if (_falling)
			{
				tu = 0;
			}
			int energy = tu;
			if (dir >= Pathfinding::DIR_UP)
			{
				energy = 0;
			}
			else if (_action.run)
			{
				tu *= 0.75;
				energy *= 1.5;
			}
			if (tu > _unit->getTimeUnits())
			{
				if (_parent->getPanicHandled() && tu < 255)
				{
					_action.result = "STR_NOT_ENOUGH_TIME_UNITS";
				}
				_pf->abortPath();
				_unit->setCache(0);
				_parent->getMap()->cacheUnit(_unit);
				_parent->popState();
				return;
			}

			if (energy / 2 > _unit->getEnergy())
			{
				if (_parent->getPanicHandled())
				{
					_action.result = "STR_NOT_ENOUGH_ENERGY";
				}
				_pf->abortPath();
				_unit->setCache(0);
				_parent->getMap()->cacheUnit(_unit);
				_parent->popState();
				return;
			}

			if (_parent->getPanicHandled() && _parent->checkReservedTU(_unit, tu) == false)
			{
				_pf->abortPath();
				_unit->setCache(0);
				_parent->getMap()->cacheUnit(_unit);
				return;
			}

			// we are looking in the wrong way, turn first (unless strafing)
			// we are not using the turn state, because turning during walking costs no tu
			if (dir != _unit->getDirection() && dir < Pathfinding::DIR_UP && !_pf->getStrafeMove())
			{
				_unit->lookAt(dir);
				_unit->setCache(0);
				_parent->getMap()->cacheUnit(_unit);
				return;
			}

			// now open doors (if any)
			if (dir < Pathfinding::DIR_UP)
			{
				int door = _terrain->unitOpensDoor(_unit, false, dir);
				if (door == 3)
				{
					return; // don't start walking yet, wait for the ufo door to open
				}
				if (door == 0)
				{
					_parent->getMod()->getSoundByDepth(_parent->getDepth(), Mod::DOOR_OPEN)->play(-1, _parent->getMap()->getSoundAngle(_unit->getPosition())); // normal door
				}
				if (door == 1)
				{
					_parent->getMod()->getSoundByDepth(_parent->getDepth(), Mod::SLIDING_DOOR_OPEN)->play(-1, _parent->getMap()->getSoundAngle(_unit->getPosition())); // ufo door
					return; // don't start walking yet, wait for the ufo door to open
				}
			}
			for (int x = size; x >= 0; --x)
			{
				for (int y = size; y >= 0; --y)
				{
					BattleUnit* unitInMyWay = _parent->getSave()->getTile(destination + Position(x,y,0))->getUnit();
					BattleUnit* unitBelowMyWay = 0;
					Tile* belowDest = _parent->getSave()->getTile(destination + Position(x,y,-1));
					if (belowDest)
					{
						unitBelowMyWay = belowDest->getUnit();
					}
					// can't walk into units in this tile, or on top of other units sticking their head into this tile
					if (!_falling &&
						((unitInMyWay && unitInMyWay != _unit)
						|| (belowDest && unitBelowMyWay && unitBelowMyWay != _unit &&
						(-belowDest->getTerrainLevel() + unitBelowMyWay->getFloatHeight() + unitBelowMyWay->getHeight())
						>= 28)))  // 4+ voxels poking into the tile above, we don't kick people in the head here at XCom.
					{
						_action.TU = 0;
						_pf->abortPath();
						_unit->setCache(0);
						_parent->getMap()->cacheUnit(_unit);
						_parent->popState();
						return;
					}
				}
			}
			// now start moving
			dir = _pf->dequeuePath();
			if (_falling)
			{
				dir = Pathfinding::DIR_DOWN;
			}

			if (_unit->spendTimeUnits(tu))
			{
				if (_unit->spendEnergy(energy))
				{
					Tile *tileBelow = _parent->getSave()->getTile(_unit->getPosition() + Position(0,0,-1));
					_unit->startWalking(dir, destination, tileBelow, onScreen);
					_beforeFirstStep = false;
				}
			}
			// make sure the unit sprites are up to date
			if (onScreen)
			{
				if (_pf->getStrafeMove())
				{
					// This is where we fake out the strafe movement direction so the unit "moonwalks"
					int dirTemp = _unit->getDirection();
					_unit->setDirection(_unit->getFaceDirection());
					_parent->getMap()->cacheUnit(_unit);
					_unit->setDirection(dirTemp);
				}
				else
				{
					_parent->getMap()->cacheUnit(_unit);
				}
			}
		}
		else
		{
			postPathProcedures();
			return;
		}
	}

	// turning during walking costs no tu
	if (_unit->getStatus() == STATUS_TURNING)
	{
		// except before the first step.
		if (_beforeFirstStep)
		{
			_preMovementCost++;
		}

		_unit->turn();

		// calculateFOV is unreliable for setting the unitSpotted bool, as it can be called from various other places
		// in the code, ie: doors opening, and this messes up the result.
		_terrain->calculateFOV(_unit);
		unitSpotted = (!_falling && !_action.desperate && _parent->getPanicHandled() && _numUnitsSpotted != _unit->getUnitsSpottedThisTurn().size());

		// make sure the unit sprites are up to date
		_unit->setCache(0);
		_parent->getMap()->cacheUnit(_unit);

		if (unitSpotted && !_action.desperate && !_unit->getCharging() && !_falling)
		{
			if (_beforeFirstStep)
			{
				_unit->spendTimeUnits(_preMovementCost);
			}
			if (Options::traceAI) { Log(LOG_INFO) << "Egads! A turn reveals new units! I must pause!"; }
			_unit->setHiding(false); // not hidden, are we...
			_pf->abortPath();
			_unit->abortTurn(); //revert to a standing state.
			_unit->setCache(0);
			_parent->getMap()->cacheUnit(_unit);
			_parent->popState();
		}
	}
}
示例#3
0
/**
 * calculateTrajectory.
 * @return the objectnumber(0-3) or unit(4) or out of map (5) or -1(no line of fire)
 */
int Projectile::calculateTrajectory(double accuracy)
{
	Position originVoxel, targetVoxel;
	Tile *targetTile = 0;
	int direction;		
	int dirYshift[24] = {1, 3, 9, 15, 15, 13, 7, 1,  1, 1, 7, 13, 15, 15, 9, 3,  1, 2, 8, 14, 15, 14, 8, 2};
	int dirXshift[24] = {9, 15, 15, 13, 8, 1, 1, 3,  7, 13, 15, 15, 9, 3, 1, 1,  8, 14, 15, 14, 8, 2, 1, 2};
	int offset = 0;

	originVoxel = Position(_origin.x*16, _origin.y*16, _origin.z*24);
	BattleUnit *bu = _action.actor;
	
	if (bu->getArmor()->getSize() > 1)
	{
		offset = 16;
	}
	else if(_action.weapon == _action.weapon->getOwner()->getItem("STR_LEFT_HAND") && !_action.weapon->getRules()->isTwoHanded())
	{
		offset = 8;
	}

	// take into account soldier height and terrain level if the projectile is launched from a soldier
	if (_action.actor->getPosition() == _origin)
	{
		// calculate offset of the starting point of the projectile
		originVoxel.z += -_save->getTile(_origin)->getTerrainLevel();

		originVoxel.z += bu->getHeight() + bu->getFloatHeight();
		originVoxel.z -= 4;
		if (originVoxel.z >= (_origin.z + 1)*24)
		{
			_origin.z++;
		}
		direction = bu->getDirection();
		if (bu->getTurretType() != -1)
			direction = bu->getTurretDirection();
		originVoxel.x += dirXshift[direction+offset]*bu->getArmor()->getSize();
		originVoxel.y += dirYshift[direction+offset]*bu->getArmor()->getSize();
	}
	else
	{
		// don't take into account soldier height and terrain level if the projectile is not launched from a soldier(from a waypoint)
		originVoxel.x += 8;
		originVoxel.y += 8;
		originVoxel.z += 12;
	}

	if (_action.type == BA_LAUNCH || (SDL_GetModState() & KMOD_CTRL) != 0)
	{
		// target nothing, targets the middle of the tile
		targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24 + 12);
	}
	else
	{
		// determine the target voxel.
		// aim at the center of the unit, the object, the walls or the floor (in that priority)
		// if there is no LOF to the center, try elsewhere (more outward).
		// Store this target voxel.
		targetTile = _save->getTile(_action.target);
		Position hitPos;
		int test = -1;
		if (targetTile->getUnit() != 0)
		{
			if (_origin == _action.target || targetTile->getUnit() == _action.actor)
			{
				// don't shoot at yourself but shoot at the floor
				targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24);
			}
			else
			{
				_save->getTileEngine()->canTargetUnit(&originVoxel, targetTile, &targetVoxel, bu);
			}
		}
		else if (targetTile->getMapData(MapData::O_OBJECT) != 0)
		{
			if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_OBJECT, &targetVoxel, bu))
			{
				targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24 + 10);
			}
		}
		else if (targetTile->getMapData(MapData::O_NORTHWALL) != 0)
		{
			if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_NORTHWALL, &targetVoxel, bu))
			{
				targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16, _action.target.z*24 + 9);
			}
		}
		else if (targetTile->getMapData(MapData::O_WESTWALL) != 0)
		{
			if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_WESTWALL, &targetVoxel, bu))
			{
				targetVoxel = Position(_action.target.x*16, _action.target.y*16 + 8, _action.target.z*24 + 9);
			}
		}
		else if (targetTile->getMapData(MapData::O_FLOOR) != 0)
		{
			if (!_save->getTileEngine()->canTargetTile(&originVoxel, targetTile, MapData::O_FLOOR, &targetVoxel, bu))
			{
				targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24);
			}
		}
		else
		{
			// target nothing, targets the middle of the tile
			targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24 + 10);
		}
		test = _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, false, &_trajectory, bu);
		if (test == 4 && !_trajectory.empty())
		{
			hitPos = Position(_trajectory.at(0).x/16, _trajectory.at(0).y/16, _trajectory.at(0).z/24);
			if (_save->getTile(hitPos) && _save->getTile(hitPos)->getUnit() == 0) //no unit? must be lower
			{
				hitPos = Position(hitPos.x, hitPos.y, hitPos.z-1);
			}
		}
		if (test != -1 && !_trajectory.empty() && _action.actor->getFaction() == FACTION_PLAYER && _action.autoShotCounter == 1)
		{
			//skip already estimated hitPos
			if (test != 4)
			{
				hitPos = Position(_trajectory.at(0).x/16, _trajectory.at(0).y/16, _trajectory.at(0).z/24);
			}
			if (hitPos != _action.target && _action.result == "")
			{
				if (test == 2)
				{
					if (hitPos.y - 1 == _action.target.y)
					{
						_trajectory.clear();
						return _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, true, &_trajectory, bu);
					}
				}
				if (test == 1)
				{
					if (hitPos.x - 1 == _action.target.x)
					{
						_trajectory.clear();
						return _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, true, &_trajectory, bu);
					}
				}
				_trajectory.clear();
				return -1;
			}
		}
		_trajectory.clear();
	}

	// apply some accuracy modifiers (todo: calculate this)
	// This will results in a new target voxel
	if (_action.type != BA_LAUNCH)
		applyAccuracy(originVoxel, &targetVoxel, accuracy, false, targetTile);

	// finally do a line calculation and store this trajectory.
	return _save->getTileEngine()->calculateLine(originVoxel, targetVoxel, true, &_trajectory, bu);
}
示例#4
0
/**
 * calculateTrajectory.
 * @return true when a trajectory is possible.
 */
bool Projectile::calculateThrow(double accuracy)
{
	Position originVoxel, targetVoxel;
	bool foundCurve = false;

	// object blocking - can't throw here
	if (_action.type == BA_THROW &&_save->getTile(_action.target) && _save->getTile(_action.target)->getMapData(MapData::O_OBJECT) && _save->getTile(_action.target)->getMapData(MapData::O_OBJECT)->getTUCost(MT_WALK) == 255)
	{
		return false;
	}

	originVoxel = Position(_origin.x*16 + 8, _origin.y*16 + 8, _origin.z*24);
	originVoxel.z += -_save->getTile(_origin)->getTerrainLevel();
	BattleUnit *bu = _save->getTile(_origin)->getUnit();
	if(!bu)
		bu = _save->getTile(Position(_origin.x, _origin.y, _origin.z-1))->getUnit();
	originVoxel.z += bu->getHeight() + bu->getFloatHeight();
	originVoxel.z -= 3;
	if (originVoxel.z >= (_origin.z + 1)*24)
	{
		_origin.z++;
	}


	// determine the target voxel.
	// aim at the center of the floor
	targetVoxel = Position(_action.target.x*16 + 8, _action.target.y*16 + 8, _action.target.z*24 + 2);

	// we try 4 different curvatures to try and reach our goal.
	double curvature = 1.0;
	while (!foundCurve && curvature < 5.0)
	{
		_save->getTileEngine()->calculateParabola(originVoxel, targetVoxel, false, &_trajectory, bu, curvature, 1.0);
		if ((int)_trajectory.at(0).x/16 == (int)targetVoxel.x/16 && (int)_trajectory.at(0).y/16 == (int)targetVoxel.y/16 && (int)_trajectory.at(0).z/24 == (int)targetVoxel.z/24)
		{
			foundCurve = true;
		}
		else
		{
			curvature += 1.0;
		}
		_trajectory.clear();
	}
	if ( AreSame(curvature, 5.0) )
	{
		return false;
	}

	// apply some accuracy modifiers
	if (accuracy > 1)
		accuracy = 1;
	static const double maxDeviation = 0.08;
	static const double minDeviation = 0;
	double baseDeviation = (maxDeviation - (maxDeviation * accuracy)) + minDeviation;
	double deviation = RNG::boxMuller(0, baseDeviation);

	_trajectory.clear();
	// finally do a line calculation and store this trajectory.
	_save->getTileEngine()->calculateParabola(originVoxel, targetVoxel, true, &_trajectory, bu, curvature, 1.0 + deviation);

	Position endPoint = _trajectory.at(_trajectory.size() - 1);
	endPoint.x /= 16;
	endPoint.y /= 16;
	endPoint.z /= 24;
	// check if the item would land on a tile with a blocking object, if so then we let it fly without deviation, it must land on a valid tile in that case
	if (_save->getTile(endPoint) && _save->getTile(endPoint)->getMapData(MapData::O_OBJECT) && _save->getTile(endPoint)->getMapData(MapData::O_OBJECT)->getTUCost(MT_WALK) == 255)
	{
		_trajectory.clear();
		// finally do a line calculation and store this trajectory.
		_save->getTileEngine()->calculateParabola(originVoxel, targetVoxel, true, &_trajectory, bu, curvature, 1.0);
	}


	return true;
}